US9868592B2 - Brake system for conveyor take-up mechanism - Google Patents

Brake system for conveyor take-up mechanism Download PDF

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Publication number
US9868592B2
US9868592B2 US15/288,742 US201615288742A US9868592B2 US 9868592 B2 US9868592 B2 US 9868592B2 US 201615288742 A US201615288742 A US 201615288742A US 9868592 B2 US9868592 B2 US 9868592B2
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carriage
brake
pulley
belt
support structure
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US15/288,742
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US20170101270A1 (en
Inventor
Andrew P. de Lore
Matthew John Croker
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Continental Global Material Handling LLC
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Joy MM Delaware Inc
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Assigned to JOY MM DELAWARE, INC reassignment JOY MM DELAWARE, INC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DE LORE, ANDREW P., CROKER, MATTHEW JOHN
Priority to US15/848,062 priority patent/US10011432B2/en
Application granted granted Critical
Publication of US9868592B2 publication Critical patent/US9868592B2/en
Priority to US15/997,454 priority patent/US10118767B2/en
Assigned to JOY GLOBAL UNDERGROUND MINING LLC reassignment JOY GLOBAL UNDERGROUND MINING LLC MERGER (SEE DOCUMENT FOR DETAILS). Assignors: JOY MM DELAWARE, INC.
Assigned to JOY GLOBAL CONVEYORS INC reassignment JOY GLOBAL CONVEYORS INC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JOY GLOBAL UNDERGROUND MINING LLC
Assigned to CONTINENTAL GLOBAL MATERIAL HANDLING INC. reassignment CONTINENTAL GLOBAL MATERIAL HANDLING INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: JOY GLOBAL CONVEYORS INC
Assigned to CONTINENTAL GLOBAL MATERIAL HANDLING LLC reassignment CONTINENTAL GLOBAL MATERIAL HANDLING LLC ENTITY CONVERSION Assignors: CONTINENTAL GLOBAL MATERIAL HANDLING INC.
Assigned to WELLS FARGO BANK, NATIONAL ASSOCIATION, AS AGENT reassignment WELLS FARGO BANK, NATIONAL ASSOCIATION, AS AGENT SECURITY AGREEMENT Assignors: CONTINENTAL GLOBAL MATERIAL HANDLING LLC
Assigned to CONTINENTAL GLOBAL MATERIAL HANDLING LLC reassignment CONTINENTAL GLOBAL MATERIAL HANDLING LLC RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: WELLS FARGO BANK, NATIONAL ASSOCIATION
Assigned to PNC BANK, NATIONAL ASSOCIATION reassignment PNC BANK, NATIONAL ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CONTINENTAL GLOBAL MATERIAL HANDLING LLC
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/44—Belt or chain tensioning arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B65G15/32—Belts or like endless load-carriers made of rubber or plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/10—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof
    • B65G21/14—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors movable, or having interchangeable or relatively movable parts; Devices for moving framework or parts thereof to allow adjustment of length or configuration of load-carrier or traction element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/24—Gearing between driving motor and belt- or chain-engaging elements
    • B65G23/26—Applications of clutches or brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04—Bulk
    • B65G2201/045—Sand, soil and mineral ore

Definitions

  • the present disclosure relates to the field of conveyor systems and particularly to a brake system for a tensioning or take-up mechanism of a conveyor.
  • Conveyor systems require a belt tensioning device, which can take many different forms.
  • Some underground conveyor systems include a tensioning or take-up system that also provides belt storage (e.g., in a belt lap arrangement). Such a system is referred to as a loop take-up (“LTU”).
  • LTU loop take-up
  • a tensioning mechanism for a conveyor system including a continuous belt.
  • the tensioning mechanism includes a support structure including a first end and a second end, a first carriage, a second carriage, and a brake mechanism.
  • the first carriage is positioned proximate the first end of the support structure and is supported for movement relative to the support structure.
  • the first carriage includes a plurality of first rolls for receiving the belt such that movement of the first carriage modifies a tension in the belt.
  • the second carriage is supported for movement relative to the support structure and includes a plurality of second rolls and at least one return pulley. The plurality of second rolls is configured to support a portion of the belt extending between the first carriage and the second carriage.
  • the brake mechanism is positioned proximate a second end of the support structure and includes a brake pulley and a brake.
  • the brake pulley is configured to support a portion of the belt extending between the brake mechanism and the return pulley.
  • the brake selectively retards rotation of the brake pulley.
  • a conveyor system in another aspect, includes a first end configured to receive material, a second end for discharging the material, a continuous belt, a drive motor, and a tensioning mechanism.
  • the continuous belt travels in an endless loop between the first end and the second end, and the continuous belt includes a first run and a second run.
  • the first run carries the material along a belt axis.
  • the drive motor moves the continuous belt between the first end and the second end.
  • the tensioning mechanism includes a support structure including a first end and a second end, a first carriage, a second carriage, and an end structure. The first carriage is positioned proximate the first end of the support structure and is supported for movement relative to the support structure.
  • the first carriage includes a plurality of first rolls for receiving the belt such that movement of the first carriage modifies a tension in the belt.
  • the second carriage is supported for movement relative to the support structure and includes a plurality of second rolls and at least one return pulley.
  • the plurality of second rolls supports a portion of the belt extending between the first carriage and the second carriage.
  • the brake frame is positioned proximate a second end of the support structure and includes a brake pulley and a brake.
  • the brake pulley supports a portion of the belt extending between the brake frame and the return pulley. The brake selectively retards rotation of the brake pulley.
  • a method for conveying material includes: driving a continuous belt between a receiving end and a discharge end, the belt including a first portion and a second portion, the first portion extending between a first carriage and a second carriage, the second portion extending between the second carriage and a brake frame; operating the tensioning mechanism in a first mode while power is supplied to a conveyor drive motor, operating in the first mode including moving the first carriage relative to the second carriage to adjust a tension in the continuous belt, a first force exerted on the second carriage by the first portion of the belt being greater than a second force exerted on the second carriage by the second portion of the belt; and while power to the conveyor drive motor is interrupted, operating the tensioning mechanism in a second mode including retarding rotation of at least one pulley supporting a second portion of the belt such that the second force is greater than the first force.
  • FIG. 1 is a perspective view of a mining operation.
  • FIG. 2 is an enlarged perspective view of the mining operation of FIG. 1 .
  • FIG. 3 is a top view of a mining operation.
  • FIG. 4 is a side view of a beam stage loader.
  • FIG. 5 is a side view of a drive unit of a gate conveyor.
  • FIG. 6 is a side view of a discharge portion of a gate conveyor.
  • FIG. 7 is a top view of a loop take-up for a gate conveyor.
  • FIG. 8 is a side view of the loop take-up of FIG. 7 .
  • FIG. 9 is a side view of an end portion of the loop take-up of FIG. 8 .
  • FIG. 10 is a perspective view of another end portion of the loop take-up of FIG. 8 .
  • FIG. 11 is a perspective view of the end portion of the loop take-up of FIG. 10 .
  • FIG. 12 is a perspective view of a brake.
  • FIG. 13 is a side view of the loop take-up during normal operation.
  • FIG. 14 is a side view of the loop take-up during a braking operation.
  • FIGS. 1 and 2 illustrate a longwall mining operation.
  • a mining machine 10 excavates material from a mine face 14 of a mineral seam 18 , progressing through the seam 18 as material is removed.
  • the mining machine 10 is a conventional longwall shearer, and the structure and operation of the shearer may be readily understood by a person of ordinary skill in the art. In other embodiments, a different type of mining machine may be used. Roof supports 22 are aligned in a row along the length of the mine face 14 to provide protection (a portion of the roof supports 22 are removed in FIGS. 1 and 2 to illustrate the mining machine 10 and the mine face 14 ).
  • the shearer 10 After the shearer 10 removes material from the mine face 14 , the material is directed onto a face conveyor 30 , which conveys the material generally parallel to the mine face 14 . The material is then deposited on a beam stage loader 38 , which may be positioned proximate an end of the face 14 .
  • the mining operation is “retreating” such that the shearer 10 progresses through the seam 18 in a direction oriented toward a mine exit (e.g., to the left in FIG. 3 ).
  • the operation may be “advancing” such that the shearer 10 progresses through the seam 18 in a direction oriented away from the mine exit.
  • the beam stage loader 38 includes a conveyor portion 42 (e.g., a chain conveyor), and a sizer 46 .
  • the conveyor portion 42 receives the material from the face conveyor 30 and moves the material into the sizer 46 , which crushes and breaks the material to reduce it to a desired size.
  • the beam stage loader 38 also supports an end 48 of the gate conveyor 50 , which receives the reduced material.
  • the gate conveyor 50 is generally supported on an inclined surface.
  • the gate conveyor 50 includes a drive unit 54 , a discharge portion 62 , and a tensioning mechanism or loop take-up 66 (hereinafter referred to as the “LTU”).
  • the gate conveyor 50 also includes a belt 70 that extends in a continuous loop between the end adjacent the beam stage loader 38 and the discharge portion 62 .
  • the LTU 66 is positioned out-bye of the beam stage loader 38 and in-bye of the drive unit 54 .
  • the term “out-bye” refers to a direction away from the mine face 14
  • the term “in-bye” refers to a direction toward the mine face 14 .
  • the out-bye direction 32 is oriented toward the left
  • the in-bye direction 34 is oriented toward the right.
  • the drive unit 54 includes drums or pulleys 74 and one or more motors 78 for rotating at least one of the pulleys 74 .
  • the term “pulley” generally refers to a drum that is rotatable about its longitudinal axis, and about which a portion of the belt 70 is wrapped or bent.
  • a pulley may be coupled to a drive motor or a brake to apply torque to the belt 70 .
  • the pulleys 74 support and move the belt 70 and transport the mined material along the gate conveyor 50 , from the beam stage loader 38 to the discharge portion 62 ( FIG. 6 ).
  • the discharge portion 62 includes a structure 82 supporting an end 84 of the belt 70 . Once material reaches the end 84 of the belt 70 , the material is deposited onto an auxiliary conveyor 86 and transported out of the mine. In some embodiments, the material may be deposited on a haulage vehicle instead of the auxiliary conveyor 86 .
  • FIGS. 7 and 8 illustrate the LTU 66 .
  • FIGS. 7 and 8 show only the portion of the belt 70 engaging the components of the LTU 66 , it is understood that the belt 70 continues to travel between the end 48 of the gate conveyor 50 proximate the beam stage loader 38 ( FIG. 4 ) and the end 84 proximate the discharge portion 62 ( FIG. 6 ).
  • the LTU 66 is a belt tensioning device and also provides storage for unused portions of the belt 70 , typically in a belt lap arrangement.
  • the storage capability permits the length of the conveyor 50 to increase or decrease in response to operation of a control module 90 that allows the belt 70 to be released (when the conveyor 50 extends) or added (when the conveyor 50 contracts).
  • the LTU 66 includes the control or winch module 90 , a first movable module or carriage 94 , a second movable carriage 98 (also referred to as a securable mobile carriage), and a stationary module or end structure or brake frame 102 .
  • the winch module 90 is positioned at a first end of the LTU 66
  • the brake frame 102 defines a second end of the LTU 66 .
  • the brake frame 102 is anchored or fixed to a mine floor 106 ( FIG. 8 ).
  • the second movable carriage 98 is in-bye of the winch module 90 and out-bye of the brake frame 102 .
  • the LTU 66 includes a support structure extending at least partially between the winch module 90 and the brake frame 102 .
  • the support structure includes standard frames or standard modules 110 , and each standard module 110 is supported on the ground or mine floor 106 .
  • the standard modules 110 include rolls (not shown) for supporting at least a lower run or return run of the belt 70
  • rails 114 extend between adjacent standard modules 110 .
  • the rails 114 may include a V-rail (not shown) on one side and a flat surface rail on the other side.
  • the V-rail orients the lateral position of the first movable carriage 94 (i.e., in a lateral direction that is perpendicular to the axis 116 of the belt 70 ).
  • the flat surface provides support for the carriages 94 , 98 while also accommodating any variation resulting from fabrication or installation alignment.
  • the LTU 66 further includes belt separation carriages or idler modules 118 supported on the standard modules 110 and positioned between the first carriage 94 and the second carriage 98 .
  • the idler modules 118 include idler rolls 120 ( FIG. 9 ) for supporting strands or runs of the belt 70 positioned about the standard modules 110 and maintaining a desired separation between adjacent strands.
  • the first carriage 94 includes first drums or pulleys 122 and the belt 70 is wrapped around portions of the first pulleys 122 .
  • the first carriage 94 further includes a first frame 126 supporting the first pulleys 122 , and the first frame 126 is supported for movement (e.g., by rollers—not shown) along the rails 114 of the standard modules 110 .
  • the first carriage 94 may be movable in a direction parallel to the belt axis 116 (e.g., a first direction 174 and a second direction 178 — FIG. 7 ).
  • the first carriage 94 is tethered to the winch module 90 by a cable or rope (not shown), and may be connected in a multi-lap reeved rope configuration.
  • the winch module 90 is driven by a variable speed gearbox and motor (not shown) and controlled by a feedback loop in communication with a load cell (not shown) that senses the tension of the belt 70 . If the winch module 90 pays out cable, the first carriage 94 is permitted to move along the rails 114 in order to maintain a desired tension in the belt 70 . Similarly, the winch module 90 may reel in the cable to move the first carriage 94 toward the winch module 90 . The winch module 90 controls the movement of the first carriage 94 along the LTU 66 to vary the length of the belt 70 that is stored. The operation of the winch module 90 and the first carriage 94 may be consistent with a winch and movable carriage in a conventional loop take-up and would be understood by a person of ordinary skill in the art.
  • moving the first carriage 94 away from the winch module 90 increases the travel length of the belt 70 , thereby taking up slack in the belt 70 and increasing tension in the belt 70 .
  • Moving the first carriage 94 toward the winch module 90 decreases the travel length of the belt 70 , thereby reducing tension in the belt 70 .
  • belt 70 is added when the gate conveyor 50 is extending and the first carriage 94 travels close to the second carriage 98 ( FIG. 8 ), and belt 70 is removed when the gate conveyor 50 is retracting and the first carriage 94 travels close to the winch module 90 .
  • the second carriage 98 includes a second frame 130 supported for movement (e.g., by rollers—not shown) along the rails 114 of the standard modules 110 .
  • the second carriage 98 also includes second drums or pulleys 134 supported on the second frame 130 , and the belt 70 is wrapped around portions of the second pulleys 134 .
  • the second carriage 98 also includes a return drum or return pulley 138 .
  • the LTU 66 also includes a stop frame 140 positioned between the winch module 90 and the brake frame 102 (i.e., between the out-bye end and the in-bye end).
  • the stop frame 140 is anchored to a mine floor 106 independent of the standard modules 110 and is positioned adjacent the second carriage 98 .
  • the brake frame 102 includes a frame structure 142 supporting a first braked drum or pulley 146 and a second braked drum pulley 150 .
  • the brake frame 102 further includes a brake system 152 including a first brake 154 coupled to the first braked pulley 146 and a second brake 158 coupled to the second braked pulley 150 .
  • the second braked pulley 150 and second brake 158 are positioned above the first braked pulley 146 and first brake 154 .
  • the first braked pulley 146 receives and supports a portion of the return run of the belt 70 from the standard modules 110 .
  • the belt 70 wraps around the first braked pulley 146 and then wraps around the return pulley 138 on the second carriage 98 .
  • the belt 70 then passes to the brake frame 102 and wraps around the second braked pulley 150 .
  • the brake frame 102 also includes a third drum or pulley 162 receiving the belt 70 from the second braked pulley 150 .
  • the return run of the belt 70 then travels toward the in-bye end of the gate conveyor 50 .
  • each brake 154 , 158 includes a member 166 (e.g., a plate— FIG. 12 ) coupled to an end of the respective braked pulley 146 , 150 and rotatable with the braked pulley 146 , 150 .
  • Each brake 154 , 158 includes an arm 170 ( FIG. 12 ) coupled to a portion of the structure 142 of the brake frame 102 and providing a reaction torque.
  • each brake 154 , 158 is a “wet” disc brake in which the components are enclosed within a housing 172 filled with fluid.
  • Each brake 154 , 158 may include one or more rotors or discs coupled to the end of the braked pulley 146 , 150 by a shaft such that the discs rotate with the shaft.
  • Each brake 154 , 158 also includes one or more friction elements or pads (not shown) and a braking actuator (e.g., springs—not shown) biasing the pads toward the discs.
  • the brakes 154 , 158 may be various types of brakes.
  • One example of a commercially available enclosed wet brake is the A+ Brake (Hydraulic Service/Spring Applied Brake), Model No. PTT-381-0, available from PT Tech, Inc.
  • A+ Brake Hydrophilic Service/Spring Applied Brake
  • PTT-381-0 Model No. PTT-381-0
  • Other aspects regarding the structure and/or operation of a wet disc brake is understood by a person of ordinary skill in the art.
  • one or more fluid actuators exert a force to compress the springs and maintain separation between the discs and the pads.
  • the fluid pressure in the actuators is reduced, and the biasing force of the springs moves the pad(s) into contact with the disc, thereby slowing rotation of the disc and the associated braked pulley 146 , 150 .
  • a hydraulic system may be configured so that pressurized fluid may be bled from the actuators in a controlled manner (e.g., via a valve) to control the engagement between the disc and the pad(s).
  • the conveyor system 50 is used in an underground mine environment and the outer surface of the housing 172 may not exceed a predetermined temperature (e.g., approximately 150 degrees Celsius).
  • a predetermined temperature e.g., approximately 150 degrees Celsius.
  • Each brake 154 , 158 may be in fluid communication with accumulators (not shown) that provide cooling fluid when the brake is applied.
  • accumulators not shown
  • a valve that is open during normal operation may be activated during a power loss to release oil from the accumulators to permit cooling.
  • the fluid may be circulated through a radiator or other heat dissipation device to cool the fluid to a predetermined temperature. After a power interruption and subsequent restoration of power, the conveyor system 50 may be restarted once the fluid is cooled to the predetermined temperature and the fluid actuators are activated to separate the pads from the discs.
  • the second carriage 98 abuts the stop frame 140 , thereby preventing the second carriage 98 from moving in a first direction 174 toward the winch module 90 ( FIG. 8 ).
  • the second carriage 98 is not constrained against movement along the rails 114 in a second direction 178 opposite the first direction 174 (i.e., away from the winch module 90 ).
  • a net force exerted on the second carriage 98 by a first portion 182 of the belt 70 positioned on the active side of the LTU 66 is greater than a second net force exerted on the second carriage 98 by a second portion 186 of the belt 70 extending between the second carriage 98 and the brake frame 102 (e.g., the in-bye side of the second carriage 98 ).
  • This imbalance biases the second carriage 98 in the first direction 174 , against the stop frame 140 .
  • the first portion 182 includes five strands or layers of belt 70 each with a tension of approximately 50 kN during normal operation (a net force of approximately 250 kN), while the second portion 186 includes two runs each with a tension of approximately 50 kN during normal operation (a net force of approximately 100 kN).
  • each portion 182 , 186 of the belt 70 may be configured to include fewer or more strands and/or may be maintained at a different tension.
  • the winch module 90 is not actively controlled and a failsafe brake engages and locks the winch drum on the winch module 90 , locking the first carriage 94 in place.
  • the loss of power causes the hydraulic pressure to release the pressure applied against the brake pads, allowing the pads to contact the discs and slow the braked pulleys.
  • cooling fluid may be released from accumulators to cool the fluid in the brakes 154 , 158 .
  • the brakes 154 , 158 apply a torque to retard the rotation of the braked pulleys 146 , 150 and thereby slow the travel of the second portion 186 of the belt 70 .
  • the net force exerted on the second carriage 98 by the second portion 186 of the belt 70 increases.
  • the second brake 158 applies a torque exceeding the tension in the first portion 182 of the belt 70 and causes the second carriage 98 to move away from the stop frame 140 , in the second direction 178 .
  • the distance between the second carriage 98 and the first carriage 94 FIG.
  • each strand in the first portion 182 transmits a tension of approximately 50 kN (net force of approximately 250 kN), while each strand in the second portion 186 transmits a tension of approximately 250 kN (net force of approximately 500 kN).
  • the second carriage 98 moves with sufficient speed to maintain a minimum tension in the belt 70 while the belt 70 is stopping, thereby preventing belt sagging.
  • the brake system 152 is spaced apart from the stop frame 140 by a predetermined stopping distance to provide sufficient travel for the second carriage 98 so that the LTU 66 can take up the required amount of belt 70 during a stop.
  • the first brake 154 applies additional torque and maintains overall stopping requirements for the LTU 66 .
  • the brakes 154 , 158 apply different torques. An operator may set the braking torque applied by each brake 154 , 158 to maintain a required take-up speed, belt tension, and/or overall stopping time.
  • the belt tension is controlled only while the conveyor is powered. If power is interrupted, the winch module 90 is not actively controlled and a failsafe brake engages and locks the winch drum on the winch module 90 , locking the first carriage 94 in place.
  • the tension in the belt 70 will equalize throughout the system, producing tension waves that travel through the belt 70 until the conveyor reaches a steady state. If the conveyor uses brakes to reduce or control speed for a system on a downhill incline, the dynamic effects on the belt 70 in combination with an unpowered winch module 90 will result in unacceptably low tension in portions of the belt 70 , causing the belt 70 to slump between support rolls.
  • Some conveyors may implement a gravity tower tension device, which uses potential energy of an elevated mass to provide tension during a stop.
  • a gravity tower tension device uses potential energy of an elevated mass to provide tension during a stop.
  • an underground mining operation imposes severe restrictions on the use of a gravity tower due to the space needed to install the tower structure that supports the mass as well as the difficulty in re-locating the gravity tower as the mining operation progresses.
  • the brake system 152 uses tension forces induced in the belt 70 during braking or retarding to permit the belt storage length to be varied during an un-powered conveyor stop (e.g., when the conveyor system loses power).
  • the imbalance between the forces exerted on the second carriage 98 by the first portion 182 and the second portion 186 of the belt 70 is sufficient to move the second carriage 98 toward the brake frame 102 (e.g. in-bye, or to the right in FIG. 14 ) and permits additional belt length to be taken up by the LTU 66 .
  • the energy of the unpowered take-up movement of the second carriage 98 is transmitted to the conveyor system without requiring operator intervention.
  • the brake system 152 provides belt tension control during a stop without requiring a separate gravity-based tension device. Also, as the mining operation progresses, the brake system 152 can also be relocated with less effort than would be needed with a gravity-based tension device. In addition, belt stretch generated during braking is accommodated by kinetic energy stored in the conveyor 50 without requiring another form of stored energy like the suspended mass of the gravity tower. The system 152 also eliminates the safety risk associated with exposing operators to stored energy like a suspended mass. Furthermore, the brake system 152 does not require a powered control system, since the brakes 154 , 158 are engaged automatically or manually via unpowered controls (e.g., hydraulic controls) during a power interruption. The brake system 152 permits the conveyor system to operate in normal modes without interlocks or latches.
  • unpowered controls e.g., hydraulic controls

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Drives For Endless Conveyors (AREA)
  • Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
  • Specific Conveyance Elements (AREA)
  • Braking Arrangements (AREA)
US15/288,742 2015-10-07 2016-10-07 Brake system for conveyor take-up mechanism Active US9868592B2 (en)

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Application Number Priority Date Filing Date Title
US15/288,742 US9868592B2 (en) 2015-10-07 2016-10-07 Brake system for conveyor take-up mechanism
US15/848,062 US10011432B2 (en) 2015-10-07 2017-12-20 Brake system for conveyor take-up mechanism
US15/997,454 US10118767B2 (en) 2015-10-07 2018-06-04 Brake system for conveyor take-up mechanism

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US201562238563P 2015-10-07 2015-10-07
US15/288,742 US9868592B2 (en) 2015-10-07 2016-10-07 Brake system for conveyor take-up mechanism

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US20170101270A1 US20170101270A1 (en) 2017-04-13
US9868592B2 true US9868592B2 (en) 2018-01-16

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US15/997,454 Active US10118767B2 (en) 2015-10-07 2018-06-04 Brake system for conveyor take-up mechanism

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US10118767B2 (en) * 2015-10-07 2018-11-06 Joy Global Underground Mining Llc Brake system for conveyor take-up mechanism

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AU2016334216A1 (en) 2018-04-19
GB2557547A (en) 2018-06-20
GB2591412A (en) 2021-07-28
CN108290689A (zh) 2018-07-17
AU2016334216B2 (en) 2022-03-24
US20180111763A1 (en) 2018-04-26
GB202105450D0 (en) 2021-06-02
GB202105449D0 (en) 2021-06-02
US20180282072A1 (en) 2018-10-04
GB2591413A (en) 2021-07-28
US20170101270A1 (en) 2017-04-13
GB201806162D0 (en) 2018-05-30
CN108290689B (zh) 2021-03-09
GB2591412B (en) 2021-11-17
US10118767B2 (en) 2018-11-06
CN112722718A (zh) 2021-04-30
GB2591413B (en) 2021-11-17
GB2557547B (en) 2021-12-15
WO2017062844A1 (en) 2017-04-13

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